Arguments I've seen:
"Cassie betrayed Roxy"
"Roxy tried to kill Gregory"
"Cassie killed Monty"
"Gregory ruined the Glamrocks' lives"
THEY WERE ALL EITHER FORCED TO DO THESE THINGS, MANIPULATED INTO DOING THEM, HAD NO CHOICE, OR WERE COMPLETELY DELIRIOUS.
THEY ARE ALL VICTIMS.